Chao Phraya
Background Chao Phraya
Most important area in socio-economic viewpoint Kingdom of Thailand Area: 514,000km 2 Population: 6,180 million 25 major river basin On the Chao Phraya River Basin Largest basin in Thailand 29 provinces Drainage area 157,925km2 38% of whole population 58% of the country s GDP
rainage Area Ping (39,880km 2 ) Wang (11,240km 2 ) Yom (23,550km 2 ) Ping River Wang River Yom River Nan River Nan (31,830km 2 ) Sakae Krang Pasak (18,200km 2 ) Chao Phraya (16,200km 2 ) Tha Chin Sirikit Reservoir Pasak River Bhumibol Reservoir Sakae Krang River Nakhon Sawan (C.2) Tha Chin River Chao Phraya River Basin Pasak Reservoir Chao Phraya River
Bhumibol Dam River: Ping River Purpose: Irrigation, Power Generation, Flood Control, Navigation Drainage Area: 26,386 (sq. km) Annual Inflow: 5,256 (MCM), 199.2 (mm) Storage at Maximum W.L.: 13,462 (MCM) Reservoir Surface Area: 316.0 (sq. km) Dam Type: Gravity Arch
Sirikit Dam River: Nan River Purpose: Irrigation, Power Generation, Flood Control, Navigation Drainage Area: 13,130 (sq. km) Annual Inflow: 5,600 (MCM), 427.5 (mm) Storage at Maximum W.L.: 10,508 (MCM) Reservoir Surface Area: 260.0 (sq. km) Dam Type: Earthfill
Nakhon Sawan Nakhon Sawan 1964, Bhumibol, Ping 1977, Sirikit, Nan 1993, Mae Kuang, Ping 1972, Kiu Lom, Wang 1982, Naresuan, Nan 1984, Mae Ngat, Ping
Nakhon Sawan C.2
Bhumibol P.12 Bhumibol Dam
Bhumibol Dry Season Wet Season Dry Season Feb Dec Oct Aug Jun Apr 1969 1974 1979 1984 1989 1994 1999 Year Inflow >1 Inflow < 1
Bhumibol
Sirikit N.12A
Spectrum Analysis Using FFT x ( t) X ( f ) X ( f ) x( t) i2πft = e 0 p ( = 2 ; p : ) x( j) ( j = 0,1,2, L, N 1) N X ( k) X N 1 ( k) = x( j) = j= 0 N 1 j= 0 x ( j) exp i2π exp i2π k T jk N dt jt N T N T N ( k = 0,1,2, L, N 2) t = T N f f = k f f N = 1 T t = j t = = N j( T N ) = k T = k ( N t) ( 2T ) = 1 ( 2 t) (Nyquist
Spectrum Analysis Using FFT (contd.) f Nyquist f k k N 2 FFT t x N ( ) ~ P k T 1 = E T 1 = E T [ X ( k) X *( k) ] [ ( ) ] 2 X k E
19562001Nakhon Sawan
Nakhon Sawan C.12 19561967 Normalized Spectrum -1-2 50 100 150 200 250 300 350 400 121 days - 182 days 365 days Days -3-4 -5-6 -7-8
Nakhon Sawan C.12 19691976 Normalized Spectrum -1-2 50 100 150 200 250 300 350 400 121 days - 182 days 365 days Days -3-4 -5-6 -7-8
Nakhon Sawan C.12 19782001 Normalized Spectrum -1-2 50 100 150 200 250 300 350 400 121 days - 182 days 365 days Days -3-4 -5-6 -7-8
Nakhon Sawan C.2 19561967 Normalized Spectrum -1-4 6 8 10 Days -2-3 -4-5 -6-7 -8
akhon Sawan C.2 19691976 Bhumibol Normalized Spectrum -1 4 6 8 10 Days -2-3 -4 3.5 days 7 days -5-6 -7-8
akhon Sawan C.2 19782001 Bhumibol&Sirikit Normalized Spectrum -1 4 6 8 10 7 days Days -2-3 3.5 days -4-5 -6-7 -8
Bhumibol 19782001 Normalized Spectrum 3.5 days 7 days 4 6 8 10 Days 2.3 days -1-2 -3-4 -5-6 -7-8
Sirikit 19782001 2.3 days 3.5 days 7 days
BhumibolSirikit
BhumibolSirikit Weekly Demand
BhumibolSirikit
BhumibolSirikit 11 630 6 BhumibolSirikit 6,500MCM 80 90 Bhumibol 160m 3 /sec
BhumibolSirikit Bhumibol Sirikit 1995 1995 upper rule curve lower rule curve BhumibolSirikit
Bhumibol
Sirikit
BhumibolSirikit Nakhon Sawan C.2 Bhumibol Sirikit
Nakhon Sawan 3.57 BhumibolSirikit
Bhumibol P.12 Before Dam Construction After Dam Construction
Sirikit N.12A